Magnet-winding machine.



PATENTED JU'NE'Q, 1908.y

F. H. LOVERIDGE. l MAGNET WINDING MACHINE. APAPLIOATION FILED mm1?, 1'903 8 SHEETS-SHEET l.

Wvg-M527@ PATENTED JUNE 9, 1908.

' lNo. 890,244.

F. H. LOVERIDGE. MAGNET WINDING MACHINE.

8 SHEETS-SHEET 2.

APPLICATION IILED APR. 17J 1903.

' Ey l No 890244- PATBNTED JUNE 9, 1908. F., H. LQVBRIDGE. f

MAGNET WINDING MACHINE,

APPLICATION PILED'MR. 17, i903.

. a SHEETS-SHEET 5.

No. 890,244. PATEN'I'ED JUNE 9, 1908.

` I'. H. LOVBRIDGE. MAGNET WINDING MACHINE.

APPLICATION FILED AFE.1'7, 1903.

:u A' I 8 SEBETS-SHEET 6.

A@ 000 w @I ff// Y @Wgr PATENTED JUNE 9, 1908. F. H. LOVERIDGE. MAGNET WINDING MACHINE.

APPLICATION FILED AP B..17, 1903.

8 SHEETS-SHEET '7.

@afm/7%;

No. 890,244. PATENTE@ JUNE 9,` 1908.

E. E. LOVERIDGE. MAGNET WINNING MACHINE.

sEEETs-SEEET a.

APPLICATION' FILED APB.. 17, 1903.

UNITED sTATEs PATENT OEEICE,

FREDERICK II. LOVERIDCE, or CHICAGO, ILLINoIs, AssICNoR To WESTERN ELECTRIC COM- PINI', or CHICAGO, ILLINOIS, n CORPORATION or ILLINOIS.

MAGNET-WINDING MACHINE.

specification of Letters Patent. Apimeaann medn'prii 17, 1903. serial No. 153,020. l

Patented .rune e, 190s.

To all whom itmay concern:

Be it known that I, FREDERICK H. LOVE- RIDGE, a citizen of the United States, residing' matter of'this application is capable of automatically windingv any required number of turns of fine wire upon a magnet spool without attention from the'operator beyond the mere placing of the Inagnet spool in position,

attaching the wire and starting the. machine,

`and this winding will be laid regularly and compactly, 'without crossing. over of' neigh- "boring convolutions, without requiring paper insulation between layers, and Without any y danger of breaking the wire, stripping the verylig'ht silk covering from it, or otherwise 'im airing the eliiciency of the magnet.

further most important consideration is that the machine may be run at a very high speed 4000 revolutions per minute of the spoolbeinga good working speed, as I have found in pra ':t'iee.v An operator who by hand could Wind but sixty spools a day can with a single machine wind nearly three times that number, andfurthermore, several such machines may be run by a single operator.

In the machine of my invention -is provided a guiding roller for applying the wire to the' rotating spool, said roller being arranged to' press continuously against the spool and rotate therewith, While being rel ciprocated toand fro along the spool-by suiti10- able traverse mechanisrn The rim of the guiding roller is made of hardrubber or other substance 'having similar qualities, and a groove is cut'in the central portion of the eriphery thereof through which the wire is ed to the spool, and' the roller is .preferablyV of sufficient Width so that on one side 'or the otherof the oove,`acordin to the direction of trave along the Vspoo it will press firmly against one or morefof the convolutions last laid, to'hold 'them in position and lprevent .spooling up, or crossing over of the wire.` The travel of the guiding roller apn .the spool is, ofcourse, maintained at a e spool, this ratio being dependent upon the Obtain sufficient strength.

ratio to the speed of rotation'of the' size of the lWire being wound. In. other words, during onerevolution of the spool, the guiding roller will move along a distance periphery similar to and on'either side of the 'l central groove, to fit the convolutions last laid.' I have successfully, useda guiding roller provided with a rim of hard rubber, in the edge of -which seven V-sllaped grooves are cut, the distance between the grooves being proportioned to the diameter of the wire to be wound. The use of such a grooved guiding roller as I have described is impracticable if the periphery or grooved engaging surface isof .metal such as steel, because if the edges of the grooves are shar enough to make the roller follow roperly t e convolutions of wire, the insu ating covering of the wire would be cut. covered that a roller having a hard rubber rim willI follow perfectly the convolutions of the wirewithout in any way injuring the' insulating covering thereof. The body of the roller, however, should be made of steel to One of the diiiiculties 'to be-overcom'e is that of winding wire clear into the corner I have, however, disagainst the head of the spool and starting.

back again without undue confusion vand crossing over of the convolutionsat thecorner.

The guiding roller is of such width that` the central groove through which the wire is led onto the spool cannot guide the wire clear into the corner. I have overcome this diiiculty by winding the first two layers or so only so far into the corner as the central groove of: the roller will take the-Wire, the

roller being caused to begin its journe in the reverse direction'the instant it reac estiri corner. Later, after the initial`layers have" been wound-A on the spool, and there are thus left little depressions or spaces in the corners wherel thewire has not been carried, the guiding roller vmay Abe arranged to stop momentarily at each corner before itstarts the return journe thus allowing the wire to run free belowt e rol-ler during say six or seven revolutions of the spool, so as'to wind down intothese spaces.

Means should'be rovided for reventing the retrogression of t e guiding roller toward the axis of the spool after it is raised by the successively-increasing layers of wire upon the spool.` They preferred mechanism for doing this consists'ofa rotatable cam mounted upon the traversing carriage and acting with means, such as aweighted cord and pulley, for advancing the cam as the arm 1s raised, to Aprevent the retrogression of said arm.

i Other features of my invention .consist in the ding plarticular mechanism for quickly reverst e travel of the carriage as it reaches the end of its journey in either direction, and the mechanism for stop ing the machine after a redetermined num er of layers of wire have een wound-upon the magnet spool.

A further feature of my invention consists in the improved-mechanism which 1 have 'devised for placing the wire under tension as it is unwound from the reel onto the magnet spool, togetherwith a braking device for said vreel controlled through the agencyof the wire as it isfbeing unw'ound therefroin 'Inf the accom anying drawings, l have illustrated apmac une embodying my invention, and this machine I shall now proceed to vdescribe in detail.

' Figure 1 is a plan view of the winding machine; Fig. 2 is a front elevation thereof; Fig. 3 is a right end elevation of the machine, showing also the tension device and braking -upon-the arm which carries the` guide roller,I

mechanism of the reel from which the wire is unwound; Fig. 4 is an edge view of the tension and brake mechanism of the reel; Fig'. 5

is a left endelevation of the winding machine.l

InFigshB and 5 some of the distant parts are omitted for clearness, and in Fig. .5 the gearwheels areindicated simply by dotted lines.

Figs. 6, 7, 8, 9, 10 and 11 are detail views of the reversible mechanism for reciprocating 'the guide carriage; Figs. 12 and 13A are detail views in sectional elevation,l illustrating the automatic mechanism for'stopping the machine and cutting off current from the electric motor when the predetermined number of layers have been wound upon Vthe magnet spool, Figs. 14 and 15 are'other details of mechanismactuated by the traverse y of the carriage to control the stopping mechanisin shown in Figs. 12 and 1 3; Fig. 16 is a detail view showing. av ortion of the meeh-v anism which controls t e lost motion of thereversing gear; and Fig. 17 is an en# larged detail view showing the guiding roller bearing upon the magnet spool bei1igwound-;

The same letters of reference are used to designate the same'parts wherever they areshown.v

The mach' e'illustrated is ada ted to be driven by an electric motorcoup ed to the main shaft a, as indicated in Fi 1; The magnet spool b to be wound is dield by a chuck a provided at one end of said driving shaft, the other end of' said spool being free.

tcrotate in the dead center a2. The jaws of the chuck are actuated through `the agency of a strong compression spring a3 and ma opened by moving the chuck a4 in z rection to counteract said spring.

The wire 'w to be wound upon the 'iir spool is led fromthe reel R through suit tension and braking mechanism hereafter to be described, to an idler sheave d', and through the central groove of the `guiding roller d onto the magnet spool. Said guide roller d and idler sheave d are both mounted upon the forward end of the rocking arm c, which is pivoted at c2- to thetraversecai'riage c and forms a part thereof. A strong spring c3 acting upon the arm c causes the guiding roller tol be pressed firmly down upon the spool; but as the arm Icarrying said guidingl roller is gradually raised due to the increasing diameter of thefcop, a bell crank extension c4 of said arm is engaged by a cam e in such a manner as to prevent the arm from returning below the'point to which it has been raised.` The cam e is mounted in the rear to raise the guiding roller clear away from the spool, as when the spool is put into or taken out of the machine.

A shoulder @Gis provided upon the edge of the cam at a point to beengagcd by the lugs c5 upon the face of the bell crank arm c1 when said arme is lowered clear down, as in applying the iirst two or threelayers of wire y This shoulder e6 upon the cam acts as a catch to prevent the I to the magnet spool.

advance of the cam until the first two or three layers of wire have-been wound upon the magnet spool, whereupon the face of the bell crank extension c4 willbe moved out farenough to no'longer.- engagel with said catch or shoulder, so thatthe cam may thereafter be advanced by the weight to perform its vufunction -of preventing the retrogression extension c?, and is arranged to of the guidingroller las 'said roller is raised.

I have found it desirable .to let the guiding roller; press continuously against the spool, irrespective of slight irregularities, while the first two or' three Vlayers are being wound,

after. which the roller should not be allowed .y

to return inwardly toward the'axis of the spool afte'rit is moved' outward to an extent proportional to the greatest diameter `of the spool at any point over which it travels. vA

spring e carried bythe bell crank arm c4 is arranged to ress against the face ofthe cam 'to Aput a slig t drag `uponit, so that the cam ratchet.

- to be very-satisfactory.'

. preventin will not be too quickly res onsi've-to very slight vibrations of the roc 'n arm. z The .cam -inechanismwhich I have Vescribed for the inward .movement of the guiding ro erA has a decided advantage over any such mechanism as a pawl and ratchet, for the reason that the cam when once brought into operation is continuously actmerelymovin-g out step bystelp and being incapableof any adjustment ot er than the 'definite o'ne determined by the pawl .and

Other mechanism beside the cam' may be,en1ployed,`which will becontinuously-acting, but in practice As shown in'Fig. 17, the guiding roller which prefer to employ has seven grooves in its periphery, adapted to fit the convolutions of Wire upon the spooljthe wire being applied through the central groove. .Grooves on either side of the center, accordin .to the direction of travel along the spoo press against the three convolutions last laid, Vto hold them in position and prevent spooling upof 'the wire. The gro'oved rim of the roller should .be made of some substance such as hard rubber, which will not cut the insulating-covering of the wire.

The 'carriage c ca rryin the guiding roller is mounted upon-the en sof two rods ff', which are arranged to slide to and frein bearings sup orted by the bed-plate ofathe machine. T e upper rod f is threadedand serves as. a feed screw. A-feed nut g, ro#

, vided with a gear wheel on each en is mounted to rotate between suitable standards upon\t he bed of the machine, `sothat as the feedvnut is rotated the traversev Acare throughan idler h2.' The clutch gears h h are mounted to rotate freely upon a shaft lc, which is driven from the main shaft a ofthe -machine through suitable gear wheels 7c k2 7c3. A clutch Z issplined to rotate with the shaft 7c between the clutch gears h and h", and. is capable of sliding longitudinally of said shaft to engage one of said clutch gears and impart the rotation of said shaft thereto. The clutch l is arranged to be moved in one direction oi" the other by a reversing lever mpivoted at m -to the bed-plate o'i the ma?v chine. The reversing lever is arranged to be thrown automatically ii'rst to one side and then to the other during the operation of theV machine, to cause the traverse carriage to move to and fro and carry the guiding roller by the carriage c.

I'found the-cam.

lThe mechanism for operating the reversing lever will be understood by reference to Figs. 1, 6 and 7.. A cam plate n, having a groove in which a pin or block carried by the end ofthe reversing lever travels, is arranged to be movedftef-andffro in the bed-plate of the ing and will serve to hold the roller at any. distance from the axis of the spool, instead of.

machiuebya rod o which is in turn moved- Said rod o passes through an opening in thevcarriage c and is provided with stop nuts on either side of saidearriage, lso that as the carriage moves in one direction itwill. engage one of thestop nuts and so move the rod longitudinallyin the saine ,direction Tlien'when the movement of the carriage is rever ed (which reversal is brought about as` I shal presently describe by vthe vmovementof said rod) the carriage engages the other stop nut `and socarries the rod Ieither direction. vSaid springs may be arranged to bear upon a groovcd roller Iritrarried by the end of* the reversing lever rn to avoid friction. The operation of the reversing mechanism will be easily understood by reference to Figs 6 and 7. Assuming the parts in the position shown in Fi 6, the clutch will he thrown in position suoi that the guiding carriage with the rod o and cam plait-e connected thereto V will` be moved to the left. As the vain plate moves, the roller carried by the end of the reversing lever slides in the lower one of the oi said groove, the'spring 112 bears with in-v 'creasing force upon the roller o3. l/Vhen the cam plate reaches the extreme left-hand end of its journey, the roller n carried by the end 'of the reversing lever is brought op osite the cross groove leading to the upper ongitudinal groove and the spring n2 therefore throws the reversing lever Aover into the position shown in lFig. 7 The clutch being thus thrown over to engage the other gear wheel,

. the Jfeed nut gis driven-in the opposite direc-1- tion and causes the carriage to make its return journey. At the end of this journey, the reversing lever is again thrown into the lower groove by the spring n, as shown in Figo. The carriage is thus caused to travel to and fro to move the guide roller along the spool aslongl as the machine continues in operation. The gearing is," of course, prolongitudinal grooves parallel to one another,

.longitudinal grooves, and as it nears' the end "5 portioned so that the guiding rcller will .ein

` moved in the reverse direction.

travel through a distance substantially equal I to the thickness of the wire being laid during each revolution of thc'spool. y

The feed nut q is mounted loosely between its abutting end pieces or standards, so that there will be a certain and definite amount of .lost motion. That is to say, the carriage will -bc stationary while the feed nut is traveling along` the feed screw from onestandardto the other, before the feed screw is actually To prevent this lost motion, however, during the rst two or three reversals of the carriage, I have provided a shim p, which is normally dropped in between the feed nut and one of the abutting end pieces, so that while this shim is in place, the feed nut will have no /lost motion, and an immediate reverse movement of the feed screw and carriage will result from a reversal of rotation of the feed nut."- The shim p is carried'by a rocking shaft p. A weighted arm p? tends torock the shaft 'p' in aldirection to move the shim out of engagement with the feed nut, but during the first few journeys of the carriage, this weightedalm is g or standard c5 passing down through-the con- 'held up by apin t2 carried by an arm' t and engaging a pin p4 carried by the arm pty Said arm t is carried by a shaft t3 that is rotated step-by-step by means of a ratchet wheel t, the rotation of said ratchet wheel be.-

ing caused by pawls f t which engagel said 4wheel as the carriage is reciprocated The. arm p2 is mounted upon a stub shaft pand carries a pin p adapted to engage a finger p? carried by the shaft p to operate theshim"` when the pin t2 is removed. I y Referring now more particularly to Figs. 1 5, 12, 13, 14 vand 15, I shall proceed'to describe the controlling. mechanism 'by 'which the machine is automatically stopped lwhen the predetermined number oflayers of wire have been wound upon' the magnet spool. The motor ch'iving the machine is controlled by a switch arm g pivoted atg so as topass over the' contacts g2 g2 of a rheostat. When the switch arm is in its upperposition, as shown in Figs. 5 and 13, for example, the cur'- rent is cut off from the motor, and the motor may be' started and' the speed gradually increased by moving therswitch'arm'downward across the contact studs. The handle H connecte'd with the arm 1 is provided to lift said arm until the same is caught by stop s', order to start the machine.

is arranged to be automatically returned to its normal upper position from any point by the falling' of a stop lever 1", ,which is provided with a lug r adapted to engage a rearward extension g of said switch arm. During the operation of the machine the stop leve'ris heldl up free of the -switch "arm by a lug or stop s carried by a rod s arranged to slide in supporting 'standards s2 S213.; This sliding stop rod s is yieldingly maintained by a spring s? The switch armv A release 'arm o whereon the ratchet wheel turns, and carries two pins c o2 which are adapted, when the' reshown inFigs. l, 14 and 15, osition to interpose the stop s beneath t e end of the' stop lever 1' and so to hold said stop lever up in the position shown in Figs. 5 and 12. When the guide carriage has made the predetermined number of journeys, a pin t4 carried by the ratchet wheel t, which is advanced step by step by the reciprocation of the carriage', strikes the end of said stopslide s and movesthe same against the tension of the spring sa-that' is, to the left as seen in Figs.

l and li--until the stop s is moved from un- 'der the end of the stop lever, permitting the same to fall to the position shown in Fig. 13, whereby the lug r of said stop lever en aging lao.

the rearward extension g3 of the switc arm returns said arm to' its upper position, thus stopping. the motor.

The falling ofthe stop leveris also caused to apply. a brake uto the brake wheel a5 carried by the main shaft a/of themachine. The

brake rc .is carried by a bell-crank brake lever `vu', thelower horizontal arma2 whereofis engaged by a compression spring a? confined between the upper edge .oflsaid arm' u2 and a nut u? screwed upon the upper end/of a pin volutions of said sprlng and fastened in'the -vided for limiting the downward movement 'ofthe-arm r. lcarries a hook u whieh'is 'engagedwith the The arma2 of the brake lever stop lever r, whereby when said stop lever isy .raised the brake-is rocked against the tension., Y

of'springu3 to lift the`brake. shoe u from the wheel a5. A strongdownward pull is exerted upon the stop lever, so that when released it will'have sufficient` force in falling to return l the switch arm g to its oflm position.v

The rotation of the, ratchet wheel t is brought about. .in the reciprocation of the guidecarriage bypawls t5 t? carried upon an 'upright t7 which is fixed to the reciprocating rod o, said rod being moved, as Abefore described, by the carriage c.

lower pawl .tf -will engagethe -ratchet toadvance thesame in al contra-clockwise direction, this rotation being opposed by-a coiled spring t. Afretaining paw t8 normally prevents'the return of the ratchet wheel. by the spring. When the rod o makes its journey to the left, the upright t is also carried to the left and draws the pawl' with it, Vsaid'agawl sliding down from the top of retaining awl When the rod- -movesto-the rightfasseen in Fig. 14, the

advanced one tooth ateachtraverse of the.

guide carriage.

is fixed upon the shaft *12o t8 and into engagement with'the teeth o the lease arm iserocked', to raise the pawls t6 ts om the ratchet wheel, thus permitting the,

latter to be set back by the spring t9 to its starting position. To rook the release arm lu, a release lever of* is provided, iiXed upon the `same shaft and extending diagonally upward to the end of the stop lever r, to which it is connected by. a staple v4 in a inanl nerto permit the stop lever and release lever to move up and down together. When the .stop lever. fallsupon the Completion of fthev Winding of Aa spool, the release lever is thus rocked to raise'the pawls t t8 from. the

ratchet Wheel, whereupon ythe spring t9 draws said ratchet back 4to its normal position.

`'lhenumber of teeth on the ratchet of course determines the number of layers which will"y l be wound upon the magnet spool before' the machine is automatically stoplped.

Referringgnow more particu arly to Fig. 3,

I shall describe the improved tension mechanisin which governs the feeding of the wire froml the reel R to the winding machine, said mechanism being provided with aframe or support 32'mounted upon an upright arm 33 secured to the vbed .plate loffthe machine. The reel from which thewireis tobe unwound is iiX'ed upon a rotatable spindle 18,

which is provided with a grooved brake wheel 19. Two brake levers 20 2l pivoted at 34, 35 to1lugs carried by said supporting frame `32 are arranged to v'act upon" said brakewheel, being 'providedv with suitable brake shoes 22 23, respectively. The brake lever 20-is actuated by a powerful spring 24, and when operated is adapted effectu-ally to.

stop the rotation of, the Wheel., The 'other vor regulating brake lever 21 is actuated by-a spring 25, which is arranged to press it ymore lightly against the brake wheel under .the control of lever mechanisnwhich is operated through the agency of the wire being u nwound. Bothv of said brake levers are ari' ranged to be controlled by a tensionfgarm 26 -pivoted at 27 to a lug carried bythe support 32 of said arm carrying a pulley 28 over which the wire from-ithe-reel is passed on'its way to the winding machine. 4The 'tension arm has a wide rang'eo'f movement under the pull of the wire, but is yieldnglyheld rel tracted in position to permit' the applicationof the brakes. In additicntothe tensionlof the .brake springs exerted 'upon'.,thetension arm ina direction to retractfieaiaqretractile1 spring 30 is preferablyv providdtfif.' said tension arm. A link 29 conne'etsthe tension4v arm with the stopping brake lever 2O,v so that the initial movement of -said tension' arm under the pull of the vwire will serve todisengage the brake shoe from the wheel, leaving the reel underA the controlof the regulating brake 2i. A slotted link 31 connects the regulating brake lever with the tensionarm, so that this brake will be raised very gradually asthe arm is pulled over, after ther stopping brake has already been raised by the initial movement of said arm. By

'means of the mechanismjust described the wire is kept under substantially uniform tension as it is unwound, regardless of the speed. The initial movement of the tension arm under the pull of the wire lifts the stopping brake, and a further movement reduces the pressure of the regulating brake until the reel turns under justthe required resistance.

A greater speed of the wire will pull the tenf sion arm over a little further, so reducing the pressure of the brake, and vice versa, to keep the tension on the Wire uniform; and-when thevrnachine .is stopped, thetensionarm is instantly retractedI so that both brakes are -applied to stop the rotation of the reel.

The operation of the machine is as follows: After a' magnet spool has been placed in .position between the chuck a and the dead-center a2, the end of athe ,wireleading from the reelRand passing everpulleysv28 and d and 1 roller-d through the cenaround the guidi y l tral groove thereid is passed through a hole in the .head of th'e magnet spool and wrappedV around a terminal stri which is fastene fto the outside of the spoof.) y(See Fig. 17).

,The cam e is :then rotated by the handle e5 -,until 4 be moved downward to start the machine.

Themachine may,lofcourse, be stopped if desired by returning the switch arm to its Votiposition, but this will very rarely be necessary. As the magnet spool is rotated, .the wire fw will be wound regularly upon it,

the portion of the 'periphery of the guiding 'c x lroller being pressed u'pon the convolutions lastlaid to .hold them 1n place.l

The guide carriage is moved by the feed nut g cooperating with the threaded feed'rod f, so that -the guiding rol-ler is moved along lthe spool a distance rapproXimately equalto or slightly greater than the diameter of ythe wirevduring each revolution of the spool. As the Aguiding roller `reaches the corner formed by the lhead ofthe spool, the reversing lever lfm, is automatically thrown'as ibefore Idescribed," and' the 4travel ofthe guide carriage is reversed, whereby a second layer is wound onu-the spool on top fof that justpreviously laid. p Duringthe winding'of the rst few' layers the shim'A p. is held .in place :between the hcadefthe feed nut and .its standard,so

that lost-motion lis prevented and @the carriage caused to begin lts return j ourneyfimmef diately when the guide roller lreaches -th'ecorner of the .magnetspool But as the lguide carriage is reciprocated the ratchetwheel 'tis i119 I- io "carriage is thus standing still the wire runs advanced ste by step, and the arm t is graduallyflowere until'the pin t2 no longer supports the weighted arm p2, Iand the p is therefore raised; When this ha pens, there fwill be a. definite lost motion IVetween the feed nut g and the standard against which it abuts, so that the guide carriage Willbe causedto stand still a moment at each re-- during say six orl versal of its movement, While the seven revolutions of' the spool.

' 'free below ,the guiding roller down into the 'l corner of the spoolandba'ck again, as has been explained.

When the ,required number of layershave been-wound' upon'the magnet spool, the ratchet wheel twill have been rotated far .e ough. to bringt the pin t4. into engagement wi lh the end of the sto slide s, whereupon vthe. stop. s will be'm'ove from under the end of the stop lever r, permitting the latter to fall and stop the machine, as before eX- plained; the ratchet wheel also being releasedand set back' to its starting position.

The cam e may now. be rotatedby the handle e to raise the guide roller fromv the magnetspool, after which the spool maybe taken out of the machine 'and another substituted.

Before taking out the completed spool, "the wire may be broken, and the severed end leading to the reel fastened temporarily to the clip` Having thus 'described my linvention, I

1. In a s ool winding machine, the combinationwit spool rotating mechanism, of a' centrally grooved guiding roller for applying the wire to the spool, traverse mechanism for reciprocating said guiding roller, said mechanismbeing adapted to delay the -reversal of the guiding roller at the limit of its .traverse during a' definite number of revolutions of the spool. A

2. In a winding machine, the combination with spool-rotating mechanism, of a grooved guiding rollerjfor applying the wire to .the spool, a pivoted arm carrying said roller, a reciprocating carriage upon which said'arm is mounted,-a spring acting upon said arm to press the roller against the spool, lsaid arm eing raised by the enga ement of the'roller with the -spool as the atter increases its diameter, a rotatable cam mounted upon the carriage, acting u on said arm, and means foradvancing sai cam as the arm is' raised, to prevent retrogression of the roller.

3. In a magnet windin machine, the coml. bination with spool-rotating mechanism, of a grooved guiding roller arranged to press against the rotating spool while applying the wire thereto, reversible traverse mechanism adapted to reciprocate the roller along the spool, said-.mechanism being arranged to Idelay the return travel of the guiding roller at the cornersy of the spool, mechanism adapted ,ciprocating -the cam plate relatively to the suchlost motion duringthe winding of the .initial layer.

to prevent such delay during the winding of the initiallay'er, means for yieldingly pressing the guiding roller inward toward the aXis of thespool, and retaining mechanism brought into action after Ithe -winding of the initiallayer, adapted to hold 'said guiding roller against inward movement after it has been moved outward by the"addition of successive layers to the spool.. f

*reachesv the end of each longitudinal groove through `the cross groove, whereby the reversing lever is actuated, and means for reroller in the reciprocation of the guide carriage.

5. A tens/ion device for winding machines, -comprising a reel from whichthe 'wireis unwound, a tension arm controlled by the wire being unwound, said tension arm being adapted to be swung on itsv pivot under the pull of the wire,`a stopping brake for the reel made operative by said tension armin its position of rest, and a regulating brake for"10'6.

said reel also controlled -by said tension arm, the pressure of said regulating brake being v,gradually reduced by the advance 'of the arm under the. pull ofthe wire.

' 6. In a magnet winding machine, the combination with. s col-rotating mechanism,A of

,a guide for app ying'the wire. toY the spool, a

. carriage. for said guide adapted to be moved to vand'fro,a feed screw and nut for said moving'carriage, said feed nut being arranged to 110 have a definite lost motion with respect to saidfeedscrew upon reversal f its relative rotation, and a device adapted to prevent A 115. 7.' In a magnet winding machine, the corn- L ,bination with spool-rotatlng mechanism, ofa

guide for applying thepwire to the spool, a carriage for said gui'deadapted to be moved to and fro, a feed screwandnut for said moving carriage, said feed'nut, being arranged to have afdeiinite lost motion with respect to vsaid'feed screw upon reversal of its relative rotation, a shim p adapted to engage the feed nut to prevent .said lost motion, and mechan- 125 ism actuated after-the winding of the initial layer for withdrawing said shim from engagement with the feed nut.

8. In a magnet winding machine, the combination with spool-rotating mechanism, of a guide for applying Ithe Wire to the spool, a movable arm earrylng sind gulde arranged to press the same against the spooL-said guide bonn; rznsed as each snceeefhng layer of'wnel s Wound, scam e acting upon said arm, and

means for advancing the ca-In as the arm is raised to prevent retrogression of the guide,

said cam being provided nth a shoulder e Wlnehvls engaged by the arm 1n Lts extreme depressed posltlon to prevent the advance of the cam, whereby the retrogression of the guide is permitted durlng the wlndlng of the nlt'm layers In witness whereof, hereunto subscribe my name this 9th day of March A. 11,1903. 15 

